Abstract: Line deflection circuit in which the deflection coil is east-west modulated. In order to cancel an east-west dependent horizontal linearity defect the inductance value of the linearity correction coil is made independent of the field frequency, for example by means of a compensating current. In an embodiment this current is supplied by the shunt coil of the east-west modulator.

Abstract: Synchronizing circuit arrangement, for example for line synchronization in a television receiver, including digital means, the frequency of the oscillator being twice that of the signal to be synchronized. A frequency divider circuit, for example a master-slave flipflop, produces two output signals one of which serves as a reference signal for the phase discriminator whilest the other is applied together with the input signal of the circuit to a coincidence stage.

Abstract: A supply voltage arrangement in a television receiver, which arrangement is switched at line frequency. The diode of the arrangement is shunted by the series combination of a capacitor and a primary winding of a transformer, a secondary of which controls the switch in the line deflection circuit.

Abstract: A field deflection output circuit in which the end of the deflection coil which is not connected to the output amplifier is coupled with a terminal of a voltage source during the scan period and with the other terminal of this voltage source during the flyback period.

Abstract: A great limitation of the tolerance in the touch sensitivity is obtained by a special touch control arrangement.

Abstract: A filter circuit for separating video and audio signals has an extra resistive element added. This forms a bridge circuit that greatly increases the attenuation of the audio signal in the video channel.

Abstract: An X-ray television pick-up and display system which is suitable for continuous and short-duration pick-up operation and continuous display. In continuous pick-up operation, in display on a display device an interlaced television picture is composed of two line scanning rasters in a standard manner. In short-duration pick-up operation a synchronizing pulse generator is changed over so that a single line-scanning raster comprising an integral number of lines is obtained for information pick-up, which information is stored in a signal store which for repeated signal supply is connected to the display device. As a result, the picture displayed does not show motional unsharpness and is free from flicker effects.

Abstract: A circuit measures the beam current of a cathode ray tube and derives a control signal from it to prevent overdriving and defocussing of the CRT. The circuit can measure both peak and average values and has an isolation circuit, such as an emitter follower, to prevent loading of the cathode circuit of the CRT.

Abstract: A component holder is arranged on the windings of a diode-split line transformer. On this holder the diodes, the focus bleeder and the high-voltage bleeder can be arranged. The connection strips of the components act as soldering pins for the winding ends. The high voltage is connected via a socket connector which is clamped to the component holder by way of two snap tags. The socket connector is provided with radially extending ribs so as to increase the creepage path. The contact spring of the socket connector has a triangular shape, thus ensuring a large contact surface area.

Abstract: A circuit arrangement in which an analog signal is converted into a binary signal with the aid of two threshold limiter circuits one of which is active near a maximum and the other is active near a minimum value of the analog signal, and with two monostable multivibrators connected thereto, followed by a set-reset flipflop. Small signal passages of the thresholds near the maximum and minimum analog signal values become clearly manifest as a signal transition in the binary signal that can be displayed.

Abstract: Switching the time constant of a filter in the APC-loop of a color television receiver is done by a keyed transistor switch so that the circuit is suitable to be formed as an integrated circuit.

Abstract: In a videophone system sound, video, synchronizing and signalling signals are to be transmitted through a single pair of telephone cables of existing telephone communications. In that case sound, synchronizing and signalling signals are transmitted in a digital form and the video signals are transmitted in an analog form. It is then possible to achieve optimum picture quality at the given bandwidth of the existing telephone communications. If for the given bandwidth the video signal were also digitalized, this would be at the expense of the picture quality. However, it is then necessary to transmit information regarding clock pulses for decoding at the receiver end. To be able to synchronize at the receiver end only on two frequencies instead of on clock pulse frequency, line frequency and field frequency, the information regarding the clock pulses is cotransmitted in such a manner that a clock pulse generator at the receiver end can be synchronized therewith which generator supplies clock pulses.

Abstract: An amplifier circuit for amplifying a repetitive alternating signal, the amplifier circuit having a voltage feedback loop which includes a sampling circuit. The sampling circuit is arranged to sample the output voltage of the amplifier at a given time during each cycle of the alternating signal and to store the sampled voltage for the remainder of the cycle. This stored voltage is used as a feedback signal for the amplifier. Since the output is sampled at the same time during each cycle of the alternating signal the filter circuit in the feedback loop may be omitted and the phase shift introduced by the feedback loop may be arranged to be constant with varying frequencies. When used in a field deflection circuit for television display apparatus the deflection waveform is preferably sampled during the flyback period.

Abstract: A switchable compression-expansion device, in which a first and a second impedance are included in the emitter circuits of two emitter followers. The impedances are also included in two isolated signal circuits which are coupled via a current mirror circuit. A selection means maintains one of the two emitter followers in the non-conducting state. The current which is produced in the associated impedance by the conducting emitter follower is coupled to the other impedance by the current mirror arrangement. In the other condition of the selection circuit the reverse occurs so that two complementary transfer functions are realized.

Abstract: A straylight compensation circuit which corrects for excessive dark current features a blanking circuit to ensure a stable black level without spikes and blanking noise. The video is integrated to provide a measure of the average picture level and is added to a reference level to compare with the blanking level in the original signal. The blanking circuit has a differential amplifier with diodes to ensure a correct and stable black level without noise or spikes.

Abstract: A circuit is a combination of a switched mode power supply and a TV deflection circuit. It features a pair of switches and a pair of inductors that are tuned to selected frequencies so that when the switches are off, the inductor voltages have a half sine wave shape.

Abstract: A circuit has two resonant circuits, each having an active element integrator on the same semiconductor chip. They can therefore have their resonant frequency controlled by the same control signal.

Abstract: An apparatus for directing an antenna has an information signal being emitted in a main direction from the antenna. Two auxiliary signals are transmitted symmetrically about the antenna, from which an error signal can be derived for alignment of the antenna.

Abstract: A game apparatus which includes a vertically extending pole having a helical groove therealong and a spring wire having a helical portion disposed in the groove. The wire has a first horizontal end portion having a coiled ball receiving terminus and a second horizontal end portion which is adapted to actuate an alarm near the lower end of the pole.

Abstract: A line synchronizing circuit including a gated phase discriminator. Because the circuit may lock in to an equalizing pulse, which may give rise to a vertically divided image, gating is rendered inoperative for a given time after the post-equalization time.